How is magnesium measured

How is magnesium measured?

The molecular weight of magnesium is 24.3 g/mol, with a 2+ valence (Mg2+). The normal serum magnesium level is 0.7 to 0.85 mmol/L, but it is often expressed as equivalents per liter, 1.4 to 1.7 mEq/L (mEq/L = mmol/L × valence), or in conventional units, 1.7 to 2.1 mg/dL (mg/dL = mmol/L × molecular weight divided by 10). Normal reference levels vary from laboratory to laboratory.

Normal Magnesium Levels in Various Units

UNITSNORMAL MAGNESIUM CONCENTRATION
mmol/L0.7–0.85 mmol/L
mEq/L1.4–1.7 mEq/L
mg/dL1.7–2.1 mg/dL
mg/L17–21 mg/L
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